THE FIELD-INDUCED STATES AT THE SURFACES OF THE NEARLY-FREE-ELECTRON METALS

We have studied theoretically the energy spectra of the field-induced electronic states, generated by the positive external electric field a pplied to the Au(001) and Au(111) surfaces. The aim of this paper was to investigate the influence of the Schockley-inverted energy gap in t he metal band structure on the energies of these states. The investiga tions have been performed for different intensities F of the applied e lectric field (0 < F < 10(8) V/cm). Our results indicate that the crys tal potential influences considerably the energy spectra of the field- induced states. This effect is especially important in the case where these states appear near the energy gap.